Merging two matrices where they have the same data in 1st column

I have 2 cell matrices that are set up as below;

A
01/01/16,  21,  32,  43
03/01/16, 22, 33, 44
05/01/16, 23, 34, 45

B
01/01/16, 0, 0, 0
02/01/16, 0, 0, 0
03/01/16, 0, 0, 0
04/01/16, 0, 0, 0
05/01/16, 0, 0, 0

And I would like to merge them such that if the two matrices have a date in common then the corresponding row from matrix A is copied to matrix B. Whilst dates not in common are left with 0 values to make an output C;

C 
01/01/16,  21,  32,  43
02/01/16, 0, 0, 0
03/01/16, 22, 33, 44
04/01/16, 0, 0, 0
05/01/16, 23, 34, 45

I'm not very sure how to go about doing this so any help would be greatly appreciated.

Answer 1

[Azzi Abdelmalek]

A={'01/01/16',  21,  32,  43
'03/01/16', 22, 33, 44
'05/01/16', 23, 34, 45}
B={'01/01/16', 0, 0, 0
'02/01/16', 0, 0, 0
'03/01/16', 0, 0, 0
'04/01/16', 0, 0, 0
'05/01/16', 0, 0, 0}
C=B
idx1=ismember(B(:,1),A(:,1))
idx=ismember(A(:,1),B(:,1))
C(idx1,:)=A(idx,:)

Answer 2

[Star Strider]

This works:

A = {'01/01/16', 21, 32, 43
    '03/01/16', 22, 33, 44
    '05/01/16', 23, 34, 45};
B = {'01/01/16', 0, 0, 0
    '02/01/16,' 0, 0, 0
    '03/01/16,' 0, 0, 0
    '04/01/16', 0, 0, 0
    '05/01/16', 0, 0, 0};

Adate = cellfun(@(x)datenum(x, 'mm/dd/yy'), A(:,1));
Bdate = cellfun(@(x)datenum(x, 'mm/dd/yy'), B(:,1));
Lidx = ismember(Bdate, Adate);
C = B;
C(Lidx,:) = A